Evaluation of the image guided set-up for multiple metastases treated with tomotherapy
10.3760/cma.j.issn.0254-5098.2014.04.013
- VernacularTitle:对多发转移病灶在螺旋断层治疗中影像引导方案的评估
- Author:
Ting WEN
;
Jing LI
;
Zhiqiang LI
;
Jinjian ZHANG
;
Youxian HOU
;
Jing CHEN
;
Junsong JIA
- Publication Type:Journal Article
- Keywords:
Multiple metastases;
Tomotherapy;
Image guidance;
Setup errors
- From:
Chinese Journal of Radiological Medicine and Protection
2014;34(4):289-291
- CountryChina
- Language:Chinese
-
Abstract:
Objective To compare the setup errors between single-site and two-site image guidance in treating multiple metastases using Tomotherapy.Methods A total of 1 220 sets of megavoltage CT (MVCT) images from 50 multiple metastases patients were collected.The setup errors of two anatomic sites were determined by registration of MVCT images with planning images.Bland-Altman plot analysis was used to assess the coincidence of these two methods.Pearson correlation analysis was performed to evaluate the correlation of the setup errors determined by two sets of data and to analyze the deviation values of setup errors.Results The deviation values of setup errors more than 3 mm between two sites were 34％,46％ and 28％ in lateral (x),longitudinal (y),vertical (z) directions,respectively.The deviation values of setup errors more than 5 mm were 10％,16％ and 8％,respectively.The BlandAltman plot analysis showed that the 95％ agreement limits of agreement were (9.3,-10.6),(10.5,-11.7),(7.3,-6.9) mm in x,y,z directions,respectively,which were all out of 5 mm tolerance.The Pearson coefficient of correlation along all three directions was less than 0.05,and R2 was 0.074,0.475,and 0.178 in x,y,z directions,respectively.Conclusions To determine the setup errors for patients with multiple metastases,single-site image guidance method is not consistent,and the two site image guidance method would be recommended.
